Mystery Buttons Appear in Trac Create New Ticket Page

Steps to reproduce:

Log into https://trac.torproject.org

Visit: https://trac.torproject.org/projects/tor/newticket

See mystery squares next to "wysiwyg" radio button. Example attached.

Trac:
Username: huertanix

added component::internal services/service - trac owner::qbi priority::low reporter::huertanix severity::minor status::new trac type::defect labels

Trac:
Username: huertanix

Screenshot of mystery buttons in Trac New Ticket page.

Trac:
Username: huertanix

These buttons are supposed to contain toolbar icons. The CSS sprite image should be https://trac.torproject.org/projects/tor/chrome/common/edit_toolbar.png however https://trac.torproject.org/tor.css overwrites the default location to https://trac.torproject.org/edit_toolbar.png which isn't available.

I see this issue in High security mode in Tor Browser, but it works on medium-high, or with JavaScript turned on.

Replying to teor:

I see this issue in High security mode in Tor Browser, but it works on medium-high, or with JavaScript turned on. AFAICT the buttons aren't there when Javascript is off because they can only function with JavaScript (for dynamic insertion of Wiki Markup).

When i posted ticket:17899#comment:1 https://trac.torproject.org/edit_toolbar.png still returned 404. This is no longer the case so the buttons aren't empty anymore.

IMHO tor.css shouldn't overwrite the URL at all (unless it is really a different image, which it isn't) and should only change some colors and tweak the layout which seems to be the point of that style sheet. It would make the style sheet smaller and easier to maintain.

Just to be clear, this screenshot is of when I tried creating a new ticket using Chromium, not the Tor Browser.

Trac:
Username: huertanix
Reviewer: N/A to N/A